Solve this following
Question:

Mark $(\sqrt{)}$ against the correct answer in the following:

If $y=\sqrt{\frac{\sec x-1}{\sec x+1}}$ then $\frac{d y}{d x}=?$

A. $\sec ^{2} \mathrm{x}$

B. $\frac{1}{2} \sec ^{2} \frac{\mathrm{x}}{2}$

C. $\frac{-1}{2} \operatorname{cosec}^{2} \frac{\mathrm{x}}{2}$

D. none of these

Solution:

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